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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae9d8bba2d290a32bf01aa6cab806c861db2a94591d8dda1c6d86a3d8c92ece' 
  AND token = 'KR3RBKQka51SuxP3/Sxqad2unJfzxy/Qkit1SuKg0rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}